<template>
    <div>
        <!-- 面包屑 -->
        <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
        <!-- 提示区域 -->
          <el-alert title="添加商品信息" type="info" show-icon :closable="false" center>
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addFormRoles" ref="addFormRef" 
        label-width="100px" label-position="top">

        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat" >
            <el-cascader  v-model="addForm.goods_cat" :options="catelist" :props="cateProps"
  @change="handleChange" expand-trigger="hover"></el-cascader>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
            <!-- 复选框 -->
            <el-checkbox-group v-model="item.attr_vals">
            <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
        </el-checkbox-group>

            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">

            <!-- 上传图片 action表示图片要上传到后台api地址 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview"
            :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
            <el-button size="small" type="primary" >点击上传</el-button>
            </el-upload>
        </el-tab-pane>

        <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
        </el-tab-pane>
    </el-tabs>
    </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>

import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex:'0',
            // 添加商品的表单数据
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]
            },

            addFormRoles:{
                goods_name:[
                    {
                        required:true,
                        message:'请输入商品名称',
                        trigger:'blur'
                    }
                ],
                goods_price:[
                    {
                        required:true,
                        message:'请输入商品价格',
                        trigger:'blur'
                    }
                ],
                goods_weight:[
                    {
                        required:true,
                        message:'请输入商品重量',
                        trigger:'blur'
                    }
                ],
                goods_number:[
                    {
                        required:true,
                        message:'请输入商品数量',
                        trigger:'blur'
                    }
                ],
                goods_cat:[
                    {
                        required:true,
                        message:'请输入商品分类',
                        trigger:'blur'
                    }
                ],
                // 图片的数组
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表数据
            manyTableData:[],
            // 静态属性列表数据
            onlyTableData:[],
            // 上传图片的url地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            headerObj:{
                Authorization:
                window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false,
            
        };
    },

    created() {
        this.getCateList()
    },

    methods: {
        async getCateList(){
            const{data:res} = await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类数据失败')
            }
            this.catelist = res.data
            console.log(this.catelist);
        },
        // 级联选择器选中项变化 会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            // console.log('即将离开的标签页名字是:'+oldActiveName);
            // console.log('即将前往的标签页名字是:'+activeName);
            if(oldActiveName==='0'&& this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        async tabClicked(){
            // 证明访问的是动态参数面板
           if(this.activeIndex ==='1'){
                const{data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel:'many'
                    }
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取动态参数列表失败')
                }
                console.log(res.data);
                res.data.forEach(item=>{
                    item.attr_vals = item.attr_vals.length ===0?[]:
                    item.attr_vals.split(' ')
                })
                this.manyTableData= res.data
           }else if(
            this.activeIndex ==='2'
           ){
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel:'only'
                    }
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取静态属性列表失败')
                }
                console.log(res.data);
                this.onlyTableData = res.data
           }
        },
        // 处理图片的预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 移除图片的操作
        handleRemove(file){
            // 1．获取将要删除的图片的时路径
            const filePath = file.response.data.tmp_path
            // 2．从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x=>
                x.pic ===filePath
            )
            // 3．调用数组的splice方法，把图片信息对象，从 pics 数组中移除贝
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
    
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            console.log(response);
            // 先拼接得到一个图片信息对象 再push到pics数组中
            const picInfo = { pic:response.data.tmp_path
            }
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数和静态属性
                this.manyTableData.forEach(item=>{
                    const newInfo = {attr_id: item.attr_id,
                                    attr_value: item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                this.onlyTableData.forEach(item=>{
                    const newInfo = {attr_id:item.attr_id,
                                    attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form);
                // 发起请求添加商品
                // 商品名称必须是唯一的
                const{data:res} = await this.$http.post('goods',form)
                if(res.meta.status!==201){
                    return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })
        }

    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
};
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 5px !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>